Possession will be key for Bayern. If they control the game, and do not allow the north London side any great possession, they will qualify easily.

Arsenal will be aware that the first leg could have gone a whole lot differently had it not been for Mesut Ozil's penalty miss and WojciechSzczesny's sending off.

Having performed very well in their 4-1 FA Cup quarter-final victory over Everton at the weekend, Arsenal should be in a confident mood.

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However, with Szczesny suspended, Laurent Koscielny a doubt after sitting out the Everton game, and the likes of Aaron Ramsey, Jack Wilshere and Kim Kallstrom unavailable, Wenger's team selection will be key.

Let's take a look at the key players to watch in Tuesday's tie.

Olivier Giroud, Arsenal

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The Frenchman sat on the bench in the first leg, with the very inexperienced YayaSanogo preferred.

However, Wenger must opt for Giroud this time round as he is Arsenal's most potent goal threat.

Olivier Giroud: Has scored (17) or assisted (8) 25 goals in his 37 apps for Arsenal in all competitions #AFC